good evening. welcome to "world news." tonight, on alert, bracing for tornados, more than 50 million in the path of the severe weather tonight after those rare twin twisters caught on tape. >> it's ripping up the whole town. >> we're on the scene, the search for survivors right now. the breaking news, u.s. special forces moving in, capturing the suspected mastermind behind the benghazi attack, how they pulled this off. brian ross is right here. dr. oz in the hot seat, why he was answering the tough questions about all those companies and their weight loss promises. dr. oz right here, why he's joining the fight. inside the fall. we hear from the women who fell as hundreds watched in horror, what we never knew, their remarkable story of survival.